Operating System (OS)
Which is the layer of a computer system between the hardware and the user program

None
System environment
Operating environment
Operating system

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Operating System (OS)
Which of the following statements is not true about the FORTRAN language?

FORTRAN is a high level language
FORTRAN is extensively used to write programs for performing scientific computations
A FORTRAN program, written for the IBM-PC, is totally different from a FORTRAN program written for execution on the SUN machine
All of these
None of these

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Operating System (OS)
Trojan-Horse programs

usually are immediately discovered
None of these
do not usually work
are legitimate programs that allow unauthorized access
are hidden programs that do not show up on the system

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Operating System (OS)
Link encryption

is less secure than end-to-end encryption
can not be used in a public network
None of these
is used only to debug
is more secure than end-to-end encryption

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